selftests/bpf: make BPF_TARGET_ENDIAN non-recursive to speed up *.bpf.o build

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BPF_TARGET_ENDIAN is used in CLANG_BPF_BUILD_RULE and co macros.
It is defined as a recursively expanded variable, meaning that it is
recomputed each time the value is needed. Thus, it is recomputed for
each *.bpf.o file compilation. The variable is computed by running a C
compiler in a shell. This significantly hinders parallel build
performance for *.bpf.o files.

This commit changes BPF_TARGET_ENDIAN to be a simply expanded
variable.

    # Build performance stats before this commit
    $ git clean -xfd; time make -j12
    real	1m0.000s
    ...

    # Build performance stats after this commit
    $ git clean -xfd; time make -j12
    real	0m43.605s
    ...

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20241213003224.837030-1-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Eduard Zingerman 2024-12-12 16:32:24 -08:00 • committed by Alexei Starovoitov

parent f4f25b689b

commit 5506b7d7bb

1 changed files with 3 additions and 3 deletions

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tools/testing/selftests/bpf/Makefile

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